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Critical difference table for word recognition testing derived using computer simulation.

Edward Carney1, Robert S Schlauch

  • 1University of Minnesota, Minneapolis, MN 55455, USA. carne006@umn.edu

Journal of Speech, Language, and Hearing Research : JSLHR
|October 2, 2007
PubMed
Summary

A new table provides more accurate critical ranges for word recognition tests. This updated table, using advanced methods, refines estimates for successive test administrations, improving clinical accuracy.

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Area of Science:

  • Audiology
  • Speech-Language Pathology
  • Psychometrics

Background:

  • A 30-year-old table for word recognition score critical ranges, based on approximated variance, has been widely used clinically.
  • The previous table relied on calculations and approximations for the variance of difference scores between repeated word list administrations.

Purpose of the Study:

  • To construct an updated table for the 95% critical range of word recognition score changes.
  • To incorporate newly available methods for calculating critical ranges for monosyllabic word lists of varying lengths (10, 25, 50, 100 words).

Main Methods:

  • Utilized computer simulation to model relevant distributions for variance estimation.
  • Calculated a direct estimate of the variance of the difference score between two tests using simulated results.

Main Results:

  • The new table presented differences in 23% of its entries compared to the previous version.
  • Critical ranges were adjusted, with 82% narrowed and 18% expanded, by no more than one word correct.
  • The original table demonstrated highest accuracy for word list sizes of 25 words.

Conclusions:

  • The newly constructed table offers more precise 95% critical range estimates for word recognition tests.
  • Employing the updated table enhances the accuracy of interpreting score changes across successive test administrations.
  • This refinement is crucial for reliable clinical decision-making in audiology and speech-language pathology.